Exchange Admin & Security Specialist (Hybrid)

Aliant Resources; Mississauga; On-site; CAD 100,000 - 110,000; Part time

Job summary

Aliant Resources is seeking an experienced Exchange Administrator for a 3-month contract with the City of Mississauga. Immediate start, 35 hours/week, hybrid Exchange environment, and CISCO CES collaboration.

The role involves Exchange Admin, hybrid operations, email security collaboration, and incident response across Microsoft 365 and Cloud/On-Premises environments. Candidates should have 5+ years’ public-sector experience and PowerShell expertise.

Qualifications

• Post-secondary degree or diploma in Computer Science or a related discipline, with 5+ years of experience.
• Microsoft certifications related to Microsoft 365, Exchange, Azure, and/or Security are assets.
• Experience in a municipal government or public-sector environment.
• Knowledge of compliance, records retention, email governance, and regulatory requirements.
• Experience administering and supporting Exchange Server SE and Exchange Online (EXO), including migrations, mail flow, retention policies, transport rules, filters, eDiscovery, and best practices.
• Experience with PowerShell automation for Exchange administration and operational tasks.
• Excellent analytical, problem-solving, and troubleshooting skills.
• Excellent communication, interpersonal, and customer service skills.
• Ability to work independently and in project teams; provide expert IT guidance to clients and colleagues.
• Security credentials: three professional references and criminal background check.

Responsibilities

• Administer Exchange Hybrid architecture including OAuth authentication, federation services, organization relationships, certificate management, hybrid mail flow, free/busy integration, and mailbox migrations.
• Manage mailboxes, distribution groups, shared mailboxes, DAGs, mail flow, connectors, and hybrid configuration.
• Monitor system health, performance, capacity, and service availability.
• Plan and implement Exchange upgrades, patches, migrations, and maintenance activities.
• Troubleshoot complex messaging, mail routing, and calendar-related issues.
• Collaborate on email security with the Cyber Security team and implement policies, anti-spam, anti-malware, and encryption controls.
• Configure SMTP relay, SPF/DKIM/DMARC, mail routing, and third-party application integrations.
• Provide incident resolution via ServiceNow and maintain technical documentation; support messaging services across Microsoft 365, Entra ID, EOP, Azure, and AWS workloads.
• Participate in incident response and after-hours support as needed.

Skills

Exchange Admin

Hybrid Ops

PowerShell

Troubleshooting

Communication

Independent Work

Customer Service

Education

Post-secondary degree in Computer Science

Tools

Microsoft 365

Azure

Job description

Aliant Resources is seeking an experienced Exchange Administrator for a 3-month contract with the City of Mississauga. Immediate start, 35 hours/week, hybrid Exchange environment, and CISCO CES collaboration.

The role involves Exchange Admin, hybrid operations, email security collaboration, and incident response across Microsoft 365 and Cloud/On-Premises environments. Candidates should have 5+ years’ public-sector experience and PowerShell expertise.